Don't try and verify signatures if key is NULL (CVE-2013-0166)
Add additional check to catch this in ASN1_item_verify too.
Add target so I can build.
Add and use a constant-time memcmp.

This change adds CRYPTO_memcmp, which compares two vectors of bytes in
an amount of time that's independent of their contents. It also changes
several MAC compares in the code to use this over the standard memcmp,
which may leak information about the size of a matching prefix.
(cherry picked from commit 2ee798880a246d648ecddadc5b91367bee4a5d98)

Conflicts:
	crypto/crypto.h
	ssl/t1_lib.c
(cherry picked from commit dc406b59f3169fe191e58906df08dce97edb727c)

Conflicts:
	crypto/crypto.h
	ssl/d1_pkt.c
	ssl/s3_pkt.c
.gitignore adjustments
Make CBC decoding constant time.

This patch makes the decoding of SSLv3 and TLS CBC records constant
time. Without this, a timing side-channel can be used to build a padding
oracle and mount Vaudenay's attack.

This patch also disables the stitched AESNI+SHA mode pending a similar
fix to that code.

In order to be easy to backport, this change is implemented in ssl/,
rather than as a generic AEAD mode. In the future this should be changed
around so that HMAC isn't in ssl/, but crypto/ as FIPS expects.
(cherry picked from commit e130841bccfc0bb9da254dc84e23bc6a1c78a64e)

Conflicts:
	crypto/evp/c_allc.c
	ssl/ssl_algs.c
	ssl/ssl_locl.h
	ssl/t1_enc.c
(cherry picked from commit 3622239826698a0e534dcf0473204c724bb9b4b4)

Conflicts:
	ssl/d1_enc.c
	ssl/s3_enc.c
	ssl/s3_pkt.c
	ssl/ssl3.h
	ssl/ssl_algs.c
	ssl/t1_enc.c
Oops. Add missing file.
(cherry picked from commit 014265eb02e26f35c8db58e2ccbf100b0b2f0072)
(cherry picked from commit 7721c53e5e9fe4c90be420d7613559935a96a4fb)
Fixups.
Don't crash when processing a zero-length, TLS >= 1.1 record.

The previous CBC patch was bugged in that there was a path through enc()
in s3_pkt.c/d1_pkt.c which didn't set orig_len. orig_len would be left
at the previous value which could suggest that the packet was a
sufficient length when it wasn't.
(cherry picked from commit 6cb19b7681f600b2f165e4adc57547b097b475fd)
(cherry picked from commit 2c948c1bb218f4ae126e14fd3453d42c62b93235)

Conflicts:
	ssl/s3_enc.c
Update DTLS code to match CBC decoding in TLS.

This change updates the DTLS code to match the constant-time CBC
behaviour in the TLS.
(cherry picked from commit 9f27de170d1b7bef3d46d41382dc4dafde8b3900)
(cherry picked from commit 5e4ca556e970edb8a7f364fcb6ee6818a965a60b)

Conflicts:
	ssl/d1_enc.c
	ssl/d1_pkt.c
	ssl/s3_pkt.c
The cbc functions shouldn't be inside #ifdef OPENSSL_NO_TLSEXT
Move CRYPTO_memcmp to o_init.c when compiling with fips: cryptlib.o
is in the fips module for fips capable builds.
Timing fix mitigation for FIPS mode.
We have to use EVP in FIPS mode so we can only partially mitigate
timing differences.

Make an extra call to HMAC_Update to hash additonal blocks
to cover any timing differences caused by removal of padding.
Add ordinal for CRYPTO_memcmp: since this will affect multiple
branches it needs to be in a "gap".
Don't access EVP_MD internals directly.
ssl/s3_cbc.c: uint64_t portability fix.

Break dependency on uint64_t. It's possible to declare bits as
unsigned int, because TLS packets are limited in size and 32-bit
value can't overflow.
(cherry picked from commit cab13fc8473856a43556d41d8dac5605f4ba1f91)
ssl/s3_cbc.c: md_state alignment portability fix.

RISCs are picky and alignment granted by compiler for md_state can be
insufficient for SHA512.
(cherry picked from commit 36260233e7e3396feed884d3f501283e0453c04f)
s3/s3_cbc.c: allow for compilations with NO_SHA256|512.
(cherry picked from commit d5371324d978e4096bf99b9d0fe71b2cb65d9dc8)
update NEWS
bn_word.c: fix overflow bug in BN_add_word.
(cherry picked from commit 134c00659a1bc67ad35a1e4620e16bc4315e6e37)
update NEWS and CHANGES